<template>
 <div>
     <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
       <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
       <el-breadcrumb-item>商品管理</el-breadcrumb-item>
       <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb> 
     <!-- 卡片视图 -->
     <el-card>
         <!-- 提示区域 -->
         <el-alert title="添加商品消息" type="info" :closable="false" center show-icon></el-alert>
         <!-- 步骤条区域 -->
 <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
   <el-step title="基本信息"></el-step>
   <el-step title="商品参数"></el-step>
   <el-step title="商品属性"></el-step>
    <el-step title="商品图片"></el-step>
   <el-step title="商品内容"></el-step>
   <el-step title="完成"></el-step>
</el-steps>
        <!-- tab栏区域 -->
 <el-form :model="addForm" :rules="addFormRules" ref="ruleForm" label-width="100px" class="demo-ruleForm" label-position="top">       
  <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
    <el-tab-pane label="基本信息" name="0">
        <el-form-item label="商品名称" prop="goods_name">
          <el-input v-model="addForm.goods_name"></el-input>
        </el-form-item>
        <el-form-item label="商品价格" prop="goods_price" >
          <el-input v-model="addForm.goods_price" type="number"></el-input>
        </el-form-item>
        <el-form-item label="商品重量" prop="goods_weight">
          <el-input v-model="addForm.goods_weight" type="number">></el-input>
        </el-form-item>
        <el-form-item label="商品数量" prop="goods_number">
          <el-input v-model="addForm.goods_number" type="number"> ></el-input>
        </el-form-item>
         <el-form-item label="商品分类" prop="goods_cat">
          <el-cascader
            expand-trigger="hover"
            v-model="addForm.goods_cat"
            :options="catelist"
            :props="cateProps"
            @change="handleChange">
          </el-cascader> 
        </el-form-item>
    </el-tab-pane>
    <el-tab-pane label="商品参数" name="1">
        <!-- 渲染表单的Item项 -->
        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id"> 
           <!-- 复选框组 -->
  <el-checkbox-group v-model="item.attr_vals">
    <el-checkbox :label="cd" v-for="(cd,i) in item.attr_vals" :key="i" border></el-checkbox>
  </el-checkbox-group>
        </el-form-item>
    </el-tab-pane>
    <el-tab-pane label="商品属性" name="2">
        <!-- 渲染表单 -->
         <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id"> 
           <el-input v-model="item.attr_vals"></el-input>
        </el-form-item>
    </el-tab-pane>
    <el-tab-pane label="商品图片" name="3">
        <el-upload
         class="upload-demo"
        :action="action"
        :on-preview="handlePreview"
        :on-remove="handleRemove"
        list-type="picture"
        :headers="headerObj"
        :on-success="handlesSuccess"
        >
  <el-button size="small" type="primary">点击上传</el-button>
  <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
</el-upload>
    </el-tab-pane>
    <el-tab-pane label="商品内容" name="4">
        <!-- 副文本编辑器 -->
        <quill-editor v-model="addForm.goods_introduce" ></quill-editor>
        <!-- 添加商品的按钮 -->
        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
    </el-tab-pane>  
  </el-tabs>
  </el-form>
     </el-card>

     <!-- 图片预览 -->
<el-dialog
  title="图片预览"
  :visible.sync="previewVisible"
  width="50%"
  >
  <img :src="previewPath" alt="" class="previewImg">
</el-dialog>


    </div>
</template>

<script>
import _ from 'lodash'
 export default{
     data(){
         return{
             activeIndex: '0',
             //添加商品的表单数据对象
             addForm:{
              goods_name:'',
              goods_price:0,
              goods_weight:0,
              goods_number:0,
              //商品分类
              goods_cat:[],
              pics:[],
              //商品的详情描述
              goods_introduce:'',
              attrs:[]
             },
             //商品添加验证规则
             addFormRules:{
                 goods_name:[{required: true,message:"请输入商品名称",trigger:"blur"}],
                 goods_price:[{required: true,message:"请输入商品价格",trigger:"blur"}],
                 goods_weight:[{required: true,message:"请输入商品重量",trigger:"blur"}],
                 goods_number:[{required: true,message:"请输入商品数量",trigger:"blur"}],
                 goods_cat: [{required: true,message:"请输入分类商品",trigger:"blur"}]
               
         },
             //商品分类列表
             catelist:[],
             cateProps:{
                 label:'cat_name',
                 value:'cat_id',
                 children:'children'
             },
            //动态参数列表
            manyTableData:[],
            //静态参数
            onlyTableData:[ ],
            //图片上传路径
            action:'http://127.0.0.1:8888/api/private/v1/upload',
            //图片上传的请求头对象
            headerObj:{
                Authorization:
                window.sessionStorage.getItem('token')
            },
            //预览图片的地址
            previewPath:'',
            //图片预览的对话框
            previewVisible:false,
           
        }
     },
     created(){
         this.getCateList()
     },
     methods:{
         //获取所有商品分类数据
         async getCateList()
         {
             const {data : res} =await
             this.$http.get(`categories`)

             if(res.meta.status!==200)
             {
                 return this.$message.error("获取商品分类数据失败")
             }
             this.catelist = res.data

         },
         //级联选择器选中项变化，会触发这个函数
       handleChange(){
       
       },
        //Tab表格的切换处理函数
             beforeTabLeave(activeName,oldActiveName){
              if(oldActiveName==='0'&& this.addForm.goods_cat.length!==3)
              {
                  this.$message.error('请选择商品分类!')
                  return false; 
              }            
             },
        //Tab标签的点击处理函数
       async tabClicked(){
            //证明访问的是动态参数面板
            if(this.activeIndex==='1'){
                const{data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{sel:"many"}
                })
                 if(res.meta.status!==200)
            {
                return this.$message.error("获取动态参数列表失败!")
            }
             res.data.forEach(item=>{
                 item.attr_vals=item.attr_vals.length ===0 ? 
                 [] : item.attr_vals.split(',') 
             })
            this.manyTableData  =res.data         
          }  
          else if(this.activeIndex==='2')
          {
               const{data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{sel:"only"}
                })
                 if(res.meta.status!==200)
            {
                return this.$message.error("获取静态参数列表失败!")
            }
            this.onlyTableData = res.data
          }
        },
        //处理图片预览效果
         handlePreview(file){
           this.previewPath = file.response.data.url
           this.previewVisible=true
         },   
         //处理移除图片的操作
          handleRemove(file)
          {
           //1.获取删除图片的临时路径
           const filterPath = file.response.data.tmp_path
           //2.从pics 数组中,找到这个图片对应的索引值
           const i = this.addForm.pics.findIndex(x =>x.pic===filterPath)
           //3.调用数组的splice方法,把图片信息对象,从pics数组中移除
           this.addForm.pics.splice(i,1)
          },
          //图片上传成功执行函数
          handlesSuccess(response){
          //1.拼接得到第一个图片信息
           const picInfo = {pic: response.data.tmp_path}
          //2.将图片信息对象，push到pics数组中
          this.addForm.pics.push(picInfo)
       },
        //添加商品按钮
            add(){
                this.$refs.ruleForm.validate(async valid =>{
                    if(!valid)
                    {
                        return this.$message.error('请填写必要的表单项')
                    }
                   // 利用插件实行数据的深拷贝
                    const form = _.cloneDeep(this.addForm)
                    form.goods_cat=form.goods_cat.join(',')
                    //处理动态参数
                    this.manyTableData.forEach(item=>{
                        const newInfo = {
                            attr_id:item.attr_id,
                            attr_value:item.attr_vals.join(' ')
                        }
                        this.addForm.attrs.push(newInfo)

                    })
                    //处理静态参数
                    this.onlyTableData.forEach(item=>{
                        const newInfo = {
                            attr_id:item.attr_id,
                            attr_value:item.attr_vals
                        }
                        this.addForm.attrs.push(newInfo)
                    })
                    form.attrs = this.addForm.attrs;
                    console.log(form)
                      //发起请求添加商品
                     //商品的名称，必须是唯一的
                   const {data:res} = await this.$http.post('goods',form)
                 //  console.log(res)
                 console.log(res.meta.status)
                   if(res.meta.status==201)
                   {
                       return this.$message.error("添加商品成功!")
                   }  
                    this.$message.success("添加商品失败")
                    this.$router.push('/goods')
                })
                   
            }
     },
     //计算属性
     computed:{
         cateId(){
             if(this.addForm.goods_cat.length===3)
             {
                 return this.addForm.goods_cat[2]
             }
             return null
         } 
     }
 }

</script>

<style lang="less" scoped>
 .el-checkbox{
     margin: 0 5px 0 0 !important;
 }
 .previewImg{
     width: 100%;
 }
 .btnAdd{
     margin-top: 15px;
 }

</style>